Despite the Ten-Mile, Chernobyl, and Fukushima accidents, uranium fission reactors remain the safest options in the power generation industry, when viewed in terms of lives lost per kilowatt-hour. However, reserves of uranium-235 are limited and will be depleted 100-200 years from now.

Attempts in developing controlled thermonuclear energy sources began immediately after the first atomic weapon tests - about 60 years ago, but despite tremendous efforts they were not successful. Even if these very expensive endeavors were to finally succeed, inherent technical challenges such as huge temperatures and giant neutron fluxes will make such technologies quite cumbersome, expensive, and dangerous.